I don't mean to steal the thread, but I don't want to waste this memory and let another rare, lucid moment die before fruition.
I had a buddy up north who made a functional .50 caliber MUZZLE-LOADING Gatling back in the early '90s. Now that was a HOOT to fire at the range, but it took all day to load the 100 "cartridges" and cap 100 nipples for four or five minutes worth of actual firing. The range was shut down for about an hour afterwards, waiting for that massive cloud of smelly smoke to clear off of the firing line.
Yep...gotta love the crazy!